Device and method for treating hydrocephalus

• US 7,524,298 B2
• Filed: 05/24/2005
• Issued: 04/28/2009
• Est. Priority Date: 05/25/2004
• Status: Active Grant

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Rinderknecht, Derek, Gharib, Mostafa, Gharib, Morteza
• Primary Examiner(s): Deak; Leslie R
• Application Number:
  US11/137,852
• Publication Number:
  US 20050277865A1
• Time in Patent Office: 1,435 Days
• Field of Search: 604 7- 10, 604/6.11, 604/151, 606/153, 623/3.1, 623/3.16, 623/3.17, 417/53, 417/474
• US Class Current: 604/9
• CPC Class Codes: A61M 27/006 Cerebrospinal drainage; Accessories therefor, e.g. valves
• CPC Class Codes: A61M 5/14276 specially adapted for implantation

Abstract

A shunt system for use in a human body that is formed from a length of tube that is configured as a pump. The length of tube may be configured as a hydroimpedance pomp, whose surfaces are pressed to pump fluid in the specified direction and way. The length of tube that forms the pump may be connected to shunt inlet and outlet parts, and may also include a valve that is adjustable to prevent back draining of fluid.

Claims

1. A method, comprising:

pumping in a human body, using a collector tube having a tip section, a discharge tube having an end section, and a tube shaped element between said collector tube and said discharge tube, said pumping including pinching at least one portion of said tube shaped element to pump fluid from said collector tube to said discharge;

sensing a pressure in a body cavity and producing an output indicative of the sensed pressure; and

controlling said pinching based on said output indicative of the sensed pressure, to control an amount of said pumping using an automated controller to create plural pressure waves, which are reflected, said controlling creating said pressure waves at a first frequency and duty cycle to sum said pressure waves and said reflected pressure waves by controlling said pinching to create a new pressure wave at a time when another wave is reflected to a location of said pinching, to pump fluid within the human body in a first direction from said collector tube to said discharge tube.

2. A method as in claim 1, wherein said tube shaped element is a hydroimpedance pump formed of a length of tube that has different characteristics than at least one of said collector tube and/or said discharge tube, and actuating by pressing against and constricting an internal cross-sectional area of said length of tube.

3. A method as in claim 2, wherein said using comprises initiating a pumping action of the hydroimpedance pump by pressing against the tube.

4. A method as in claim 2, wherein the hydroimpedance pump is formed by first and second sections of elastic tube, having different elastic impedances from one another.

5. A method as in claim 4, wherein one of said sections of elastic tube comprises at least one of said collector and discharge tubes.

6. A method as in claim 2, further comprising sensing characteristics of fluid movement, and wherein said control an amount of said pumping is based on the sensed characteristics.

7. A method as in claim 6, wherein said adjusting an amount of the pumping comprises changing a frequency of the pumping.

8. A method as in claim 2, wherein said tube shaped pump comprises a plurality of separate pumping portions, each of which are separately operable to pump fluid.

9. A method as in claim 8, wherein said plurality of separate pumping portions comprise a plurality of pumping portions which are located in series with one another.

10. A method as in claim 8, wherein said plurality of separate pumping portions comprise a plurality of pumping portions which are located in parallel with one another.

11. A method as in claim 2, wherein said actuating comprises using includes a first actuator part pressing against and capable of at least partially constricting a first portion of said length of tube, and a second actuator part, pressing against and capable of at least partially constricting a second portion of said length of tubing, spaced from said first portion of said length of tubing, and wherein said controlling comprises controlling said first and second actuator parts to sum said pressure waves using a pattern of pinching said first actuator part and said second actuator part that sustain a pressure gradient in a way that lowers body cavity pressure.

12. A method as in claim 11, wherein at least one of said actuators completely constricts said tube during said pumping based on said output.

13. A method as in claim 1, further comprising detecting an orientation of said shunt system, and using a valve to close a fluid flow, based on said orientation.

14. A method as in claim 1, wherein said tube shaped pump is a hydroimpedance pump, and said actuating comprises stiffening and softening at least one portion of a wall of said pump.

15. A catheter shunt system, comprising:

a first collector catheter;

a second, discharge catheter;

a pump, formed of a length of tubing, and connected to said first and second catheters, and allowing pumping of fluid from said first catheter to said second catheter;

a pinching mechanism to create plural pressure waves in said length of tubing, which are reflected;

a body cavity pressure sensor that senses a pressure in a body cavity and produces an output indicative of the sensed pressure; and

a controller, responsive to said output of said body cavity pressure sensor, controlling said pressure waves to occur at a frequency and duty cycle to sum said pressure waves in a way to cause and control a quantity of said pumping by controlling said pinching mechanism to create a new pressure wave at a time when another wave is reflected to a location of said pinching mechanism,

wherein said pinching mechanism includes a first actuator part pressing against and capable of at least partially constricting a first portion of said length of tubing, and a second actuator part, pressing against and capable of at least partially constricting a second portion of said length of tubing, spaced from said first portion of said length of tubing, wherein said controller controls said first and second actuator parts to sum said pressure waves, using a pattern of pinching said first actuator part and said second actuator part that sustains a pressure gradient in a way that lowers body cavity pressure, and

wherein said one of said actuator parts is operable to completely pinch off a first portion of said length of tubing when completely actuated, based on said output.